killifish
noun
kil·li·fish
ˈki-li-ˌfish 
1
: any of a family (Cyprinodontidae) of numerous small oviparous fishes much used as bait and in mosquito control
2
: any of various live-bearers (family Poeciliidae)
Examples of killifish in a Sentence
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For the first time in 10 years, researchers have discovered a new species of Xenurolebias killifish from an isolated swamp about 2 feet deep in eastern Brazil.
—
Lauren Liebhaber
september 23, Miami Herald, 23 Sep. 2025
Most species are holding fewer cards than the killifish.
—Brian Owens, Smithsonian Magazine, 26 Jan. 2024
Some guppies live in havens that are largely predator-free except for the killifish, a small fish that only takes the smallest juvenile guppies.
—Ed Yong, Discover Magazine, 1 Feb. 2010
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Lauren Liebhaber
september 23, Miami Herald, 23 Sep. 2025
Most species are holding fewer cards than the killifish.
—Brian Owens, Smithsonian Magazine, 26 Jan. 2024
Some guppies live in havens that are largely predator-free except for the killifish, a small fish that only takes the smallest juvenile guppies.
—Ed Yong, Discover Magazine, 1 Feb. 2010
See All Example Sentences for killifish
Cite this Entry
“Killifish.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/killifish. Accessed 4 Nov. 2025.
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